Doses de boro e água residuária na produção do girassol

Abstract

Resumo -A disponibilidade hídrica de qualidade tem se tornado em todo o mundo, um dos principais entraves à expansão das fronteiras agrícolas. Dentro deste contexto o presente trabalho teve como objetivo avaliar os efeitos de doses de boro e da irrigação com dois tipos de água, residuária e de abastecimento, nos componentes de produção do girassol (Helianthus annuus L.) cv. EMBRAPA 122/V-2000. A pesquisa foi realizada em ambiente protegido da Universidade Federal de Campina Grande, em delineamento em blocos casualizados, analisados em esquema fatorial 5 x 2 sendo cinco doses de boro (0 -testemunha; 1,0; 2,0; 3,0 e 4,0 mg L -1 ) combinados com dois tipos de água de irrigação (R -residuária e AB -abastecimento), com três repetições. A análise estatística compreendeu análises de variância (teste F) e as médias foram comparadas pelo teste de Tukey para comparar os fatores qualitativos em 0,05 de probabilidade. Verificou-se que as doses de boro e tipos de água utilizados não influenciaram nenhuma variável ligada à produção de aquênios; no entanto, a irrigação com água residuária influenciou positivamente as variáveis fitomassa fresca e seca das folhas, do caule e da parte aérea, todas ligadas à produção de forragem. Palavras-chave -Disponibilidade hídrica. Reúso de água. Helianthus annuus -Produtividade. Aquênios.Abstract -The availability of water of quality has become worldwide, a major constraint to expanding agricultural frontiers. Within this context, this study aimed to evaluate the effects of boron doses and irrigation with two types of water, wastewater and municipal supply water, on yield components of sunflower (Helianthus annuus L.) cv. EMBRAPA 122/V-2000. The study was conducted in a greenhouse at the Federal University of Campina Grande, in a randomized block design, analyzed in a 5 x 2 factorial with five B of boron (0; 1.0; 2.0; 3.0 and 4.0 mg L -1 ) combined with two types of irrigation water (R -wastewater and AB -municipal supply water) with three replications. Statistical analysis consisted of analysis of variance (F test) and means were compared by Tukey test to compare qualitative factors at 0.05 probability. It was found that the boron levels and types of water did not affect any varieble related to production of seeds, however, irrigation with wastewater variables positively influenced the fresh and dry leaves, stem and shoot all related to forage production.

Growth Rates and Sunflower Production in Function of Fertilization with Biochar and NPK

“…These results are justified by the greater nutritional availability close to the 50% dose of the recommendation. The PNVA ranged from 10.51% to 23.47%, however, these values are lower than those reported by Santos Júnior et al (2011b) which obtained a change from 21.70% to 35.81%. According to Garcia et al (2010), progressive saline stress may induce ionic toxicity and/or nutritional imbalance due to the excessive accumulation of ions in the cellular protoplasm, and may cause cellular injury through oxidative stress, which may result in a decrease in the number of achenes, mass of achenes and, consequently, greater number of pimples.…”

Sunflower subjected to boron doses in the semi-arid from Northern Minas Gerais, Brazil

“…However, the response to the B increase can vary between genotypes; with the variety BR 122 and the hybrids Aguará and Gurupi having the largest capitulum diameter when nourished with 3 kg ha -1 of B * p < 0.05. ( Capone et al, 2016), while in contrast, the varieties Embrapa 122/V-2000, Leila and Hélio 863 did not significantly respond to doses of B (Santos Junior et al, 2011;Euba Neto et al, 2014;Khalid et al, 2020).…”

Physiological behavior of melon cultivars submitted to soil salinity1

“…Paraíba, from an agricultural point of view, stands out as a state affected by an irregular rainfall regime. These characteristics are limiting factors for agricultural development, significantly compromising the yield of agricultural crops (Santos Júnior et al 2011). Most of the time, the water available for irrigation has a moderate salt 1.…”